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Dependent patent claims for SME IP teams

As IP professionals, we often say that the claims define the protection. Independent claims set the broadest scope, but dependent claims tell a more nuanced story.

They can narrow, clarify, concretise, or sometimes merely decorate the invention. Understanding which role a dependent claim plays helps you assess the real value of a patent family more quickly.

Let's revisit US2019358554A1 (US’554). The image and summary at the top of our blog post, "Understanding patent claims", give you all the context you need to understand this application.

There are four commonly used functions of dependent claims:

Delimitation

This is one of the most common functions of dependent claims. They can be used to delimit the scope and distinguish the invention from prior art. 🎯 Claim 4 of US’554, for example, states that the two flanges and the side faces of the chassis extend in a common plane. This clearly delimits how the flanges and side faces are embodied.

Exactness

What was previously described in broad terms is now brought back to the concrete. Claim 9 says that the toy vehicle's chassis comprises complementary coupling organs. Aha 💡, we are talking about a train-like vehicle, not a helicopter, forklift or scooter. It does not really narrow the invention; rather, it makes explicit what the claim set was already aimed at.

Clarification

Okay, there are coupling organs, but don't all LEGO bricks have that? 🤔 Claims 9 and 10 clarify this: the first and second ends of the chassis comprise complementary coupling organs, and the coupling organ comprises two flexible arms extending towards each other. This makes the earlier claim language much easier to interpret.

Filler

And then there are claims that add little strategic value. They increase the claim count, but they rarely provide a meaningful fallback position. Claim 6 specifies that the axles and the wheels may be manufactured by ... injection molding.

These distinctions are not just useful when drafting. It also matters when reviewing a draft, limiting the number of claims for cost reasons, assessing competitors’ IP rights, or explaining protection scope internally. A well-structured view of claims helps separate meaningful fallback positions from formal claim volume.

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